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I'm not sure whether Apple has released an official SDK for 'Final Cut Pro', but its plug-in architecture is allegedly compatible with Adobe's 'After Effects' plug-in API, so I guess you could try using the free After Effects SDK.
For more definitive answers, you could also try posting your question or searching in the Multimedia & DV Forum here on MacNN, or over in Apple's new Multimedia Discussions Forum (login/registration now required).